48 Proceedings of the R<-'>jal Irish Academy. 



DISTEIBUTIOXAL NOTES. 



In concluding this account of the Aptervgota of the Seychelles, some 

 remarks as to the indications afforded by the geographical range of the species 

 or their near allies may be appropriate. There are thirteen species of 

 Thysanura and eighteen of Collembola recorded from the Seychelles 

 archipelago proper and the neighbouring islands of the Indian Ocean. In the 

 first place, it is necessary to tabulate the distribution of these species within 



the area itself. 



I. Seyghelles Gkoup. 



M. = Mahe. S. = Silhouette. P. = Prasliu. B. = Bird Isl. F. = Felicite. 



Thys.vjcra. 



Corethromachilis Gardineri — M.S.P. Acrotelsa coUaris — M.B. 



V. brevipalpis — M.S. Atdura juma — M. 



C. gibba —M.S. Lepidospora Braueri — 'hi. 



Lepisma intermedia— 'SV.Y . lapyx sUtestris—'SL'i. 



Isolepisma bisetoiia - M. Lepidocampa Jimbriatipes^^Lii. 

 Ctenolepisma longicaudata — F. 



Collembola. 



Neanura $exoeulata — M.S. Lepidocyrtus imjyerialis — M.S.F. 



Isotomurvs obscunts — M.S. L. Gardineri — :M. 



Heteromuricus koufiz-omis — M.S. AcanthurcUo Braueri— 1^1. S. 



Ent<mdbrya seychellarum — if.S. Jlieroparoneila caerulea — hl. 



Lepidocyrtus obscurieornis — M. M.Jlara — M. 



L. sUrestris—ti.. C'remastocephalus Seotti — M. 



Z. annulicomis — M. C. palUdus - M. 



L. straminevs — M. Cyphoderus insularis — ill'. 

 L. Fryeri—^AS.Y. 



Eleven of the Thysanura and seventeen of the Collembola are thus known 

 to inhabit the Seychelles archipelago in the restricted sense. Mahe, the 

 largest of the islands, has ten of the Thysanura and all the seventeen 

 Collembola ; Silhouette has five Thysanura and seven Collembola ; Felicite has 

 two Thysanura (one — Ctenolcpisrna lontjicavdata, proljably an introduced 

 species — not found in any other island) and two Collembola ; Praslin has one 

 of each order; finally, from Bird Island has been collected nothing except 

 the suigle Thy.sanuran Acrotelsa collaris, a house-dwelling species, probably 

 introduced by man. 



